Buggy code:
@ ComposedChecks ( validators = { AnnotationValidation . class } ) public class XtendJavaValidator extends XbaseWithAnnotationsJavaValidator { @ Inject private RichStringProcessor richStringProcessor ; @ Inject private IXtendJvmAssociations associations ; @ Inject private OverrideHelper overrideHelper ; @ Inject private DispatchHelper dispatchHelper ; @ Inject private XAnnotationUtil annotationUtil ; @ Inject private JavaKeywords javaUtils ; @ Inject private UIStrings uiStrings ; @ Inject private ILogicalContainerProvider containerProvider ; @ Inject private JvmTypeExtensions typeExtensions ; @ Inject private IVisibilityHelper visibilityHelper ; @ Inject private IJavaDocTypeReferenceProvider javaDocTypeReferenceProvider ; @ Inject private IScopeProvider scopeProvider ; @ Inject private IEObjectDocumentationProvider documentationProvider ; @ Inject private IQualifiedNameConverter qualifiedNameConverter ; @ Inject private OperatorMapping operatorMapping ; @ Inject private ImplicitReturnFinder implicitReturnFinder ; @ Inject private LocalClassAwareTypeNames localClassAwareTypeNames ; @ Inject private IBatchTypeResolver batchTypeResolver ; @ Inject private ProxyAwareUIStrings proxyAwareUIStrings ; @ Inject private AnnotationLookup annotationLookup ; protected final Set < String > visibilityModifers = ImmutableSet . of ( "public" , "private" , "protected" , "package" ) ; protected final Multimap < Class < ? > , ElementType > targetInfos ; @ Override protected List < EPackage > getEPackages ( ) { } protected boolean hasAnnotation ( XtendAnnotationTarget source , Class < ? > class1 ) { } @ Check public void checkValidExtension ( XtendField field ) { } @ Check public void checkNonRawTypeInferred ( XtendField field ) { } @ Check public void checkNonRawTypeInferred ( XtendFunction function ) { } protected void validateInferredType ( JvmTypeReference inferredType , XtendMember member , String messagePrefix , EAttribute location ) { } @ Check public void checkValidExtension ( XtendFormalParameter parameter ) { } @ Check public void checkValidExtension ( XtendVariableDeclaration variableDeclaration ) { } @ Check public void checkValidExtension ( XtendParameter parameter ) { } protected void checkValidExtensionType ( JvmIdentifiableElement identifiable , EObject source , EStructuralFeature feature ) { } @ Check public void checkAnnotationTarget ( XAnnotation annotation ) { } @ Check public void checkMultipleAnnotations ( final XtendAnnotationTarget annotationTarget ) { } private boolean isRelevantAnnotationTarget ( final XtendAnnotationTarget annotationTarget ) { } protected EObject getContainingAnnotationTarget ( XAnnotation annotation ) { } @ Check public void checkNoVoidInDependencyDeclaration ( XtendField dep ) { } @ Check public void checkNoTypeNameShadowing ( XtendTypeDeclaration type ) { } @ Check public void checkMemberNamesAreUnique ( XtendTypeDeclaration xtendType ) { } @ Check public void checkXtendParameterNotPrimitiveVoid ( XtendParameter param ) { } @ Check public void checkVarArgIsNotExtension ( XtendParameter param ) { } @ Check public void checkVarArgComesLast ( XtendParameter param ) { } @ Check public void checkClassPath ( XtendFile xtendFile ) { TypeReferences typeReferences = getServices ( ) . getTypeReferences ( ) ; final JvmGenericType listType = ( ( JvmGenericType ) ( typeReferences . findDeclaredType ( List . class , xtendFile ) ) ) ; if ( ( listType == null ) || ( listType . getTypeParameters ( ) . isEmpty ( ) ) ) { error ( "Couldn't<seq2seq4repair_space>find<seq2seq4repair_space>a<seq2seq4repair_space>JDK<seq2seq4repair_space>1.5<seq2seq4repair_space>or<seq2seq4repair_space>higher<seq2seq4repair_space>on<seq2seq4repair_space>the<seq2seq4repair_space>project's<seq2seq4repair_space>classpath." , xtendFile , XTEND_FILE__PACKAGE , JDK_NOT_ON_CLASSPATH ) ; } else if ( ( typeReferences . findDeclaredType ( ToStringBuilder . class , xtendFile ) ) == null ) { <START_BUG> error ( "Couldn't<seq2seq4repair_space>find<seq2seq4repair_space>the<seq2seq4repair_space>mandatory<seq2seq4repair_space>library<seq2seq4repair_space>'org.eclipse.xtext.xbase.lib'<seq2seq4repair_space>2.7.0<seq2seq4repair_space>or<seq2seq4repair_space>higher<seq2seq4repair_space>on<seq2seq4repair_space>the<seq2seq4repair_space>project's<seq2seq4repair_space>classpath." , xtendFile , XTEND_FILE__PACKAGE , XBASE_LIB_NOT_ON_CLASSPATH ) ; <END_BUG> } } @ Check public void checkWhitespaceInRichStrings ( RichString richString ) { } protected void doCheckWhitespaceIn ( RichString richString ) { } @ Check public void checkSuperTypes ( XtendClass xtendClass ) { } @ Check public void checkSuperTypes ( XtendInterface xtendInterface ) { } @ Check public void checkSuperTypes ( AnonymousClass anonymousClass ) { } protected void checkWildcardSupertype ( XtendTypeDeclaration xtendType , JvmTypeReference superTypeReference , EStructuralFeature feature , int index ) { } protected boolean isInvalidWildcard ( JvmTypeReference typeRef ) { } protected boolean hasCycleInHierarchy ( JvmGenericType type , Set < JvmGenericType > processedSuperTypes ) { } @ Check public void checkDuplicateAndOverriddenFunctions ( XtendTypeDeclaration xtendType ) { } protected void doCheckDuplicateExecutables ( JvmGenericType inferredType , final ResolvedFeatures resolvedFeatures , Set < EObject > flaggedOperations ) { } protected < Executable extends IResolvedExecutable > void doCheckDuplicateExecutables ( JvmGenericType inferredType , List < Executable > declaredOperations , Function < String , List < Executable > > bySignature , Set < EObject > flaggedOperations ) { } protected String typeLabel ( JvmExecutable executable ) { } protected EStructuralFeature nameFeature ( EObject member ) { } protected EStructuralFeature exceptionsFeature ( EObject member ) { } protected EStructuralFeature returnTypeFeature ( EObject member ) { } protected void doCheckOverriddenMethods ( XtendTypeDeclaration xtendType , JvmGenericType inferredType , ResolvedFeatures resolvedFeatures , Set < EObject > flaggedOperations ) { } protected void reportMissingImplementations ( XtendTypeDeclaration xtendClass , JvmGenericType inferredType , List < IResolvedOperation > operationsMissingImplementation ) { } protected void doCheckFunctionOverrides ( ResolvedFeatures resolvedFeatures , Set < EObject > flaggedOperations ) { } protected void doCheckFunctionOverrides ( IResolvedOperation operation , Set < EObject > flaggedOperations ) { } protected void doCheckFunctionOverrides ( EObject sourceElement , IResolvedOperation resolved , List < IResolvedOperation > allInherited ) { } protected String getDeclaratorName ( IResolvedOperation resolved ) { } protected void createExceptionMismatchError ( IResolvedOperation operation , EObject sourceElement , List < IResolvedOperation > exceptionMismatch ) { } protected EObject findPrimarySourceElement ( IResolvedOperation operation ) { } protected boolean isMorePrivateThan ( JvmVisibility o1 , JvmVisibility o2 ) { } @ Check public void checkDefaultSuperConstructor ( XtendClass xtendClass ) { } protected boolean isDelegatConstructorCall ( XExpression expression ) { } protected boolean isInterface ( JvmDeclaredType type ) { } protected String canonicalName ( JvmIdentifiableElement element ) { } protected String getReadableSignature ( JvmExecutable executable ) { } protected String doGetReadableSignature ( String simpleName , List < JvmFormalParameter > parameters ) { } protected String getReadableSignature ( String elementName , List < JvmTypeReference > parameterTypes ) { } @ Check public void checkParameterNames ( XtendFunction function ) { } @ Check public void checkAbstract ( XtendFunction function ) { } @ Check public void checkOperatorSignature ( XtendFunction function ) { } @ Check public void checkParameterNames ( XtendConstructor constructor ) { } @ Check public void dispatchFuncWithTypeParams ( XtendFunction func ) { } @ Check public void checkDispatchFunctions ( XtendClass clazz ) { }

Fix:
error ( "Couldn't<seq2seq4repair_space>find<seq2seq4repair_space>the<seq2seq4repair_space>mandatory<seq2seq4repair_space>library<seq2seq4repair_space>'org.eclipse.xtext.xbase.lib'<seq2seq4repair_space>2.8.0<seq2seq4repair_space>or<seq2seq4repair_space>higher<seq2seq4repair_space>on<seq2seq4repair_space>the<seq2seq4repair_space>project's<seq2seq4repair_space>classpath." , xtendFile , XTEND_FILE__PACKAGE , XBASE_LIB_NOT_ON_CLASSPATH ) ;